HTML <a> id Attribute

The id attribute on an <a> (anchor) tag assigns an identifier to the link. The identifier must be unique across the page.

Example

#

An id on an <a> tag.

<a id="ms-link" target="_blank" 
   href="https://microsoft.com">Microsoft</a>

Using id

The id attribute assigns an identifier to the <a> element.

The identifier must be unique across the page.

The id allows programmatic access to the <a> element.

Tip:  id is a global attribute that can be applied to any HTML element.


Syntax

<a id="identifier" />

Values

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Value Description
identifier A unique alphanumeric string. The id value must begin with a letter ([A-Za-z]) and may be followed by any number of letters, digits ([0-9]), hyphens (-), underscores (_), colons (:), and periods (.).

More Examples

An <a> element with a unique id value.
Clicking the button displays the link's href value.

Microsoft

<div>
  <a id="mylink" target="_blank"
     href="https://microsoft.com">Microsoft</a> 
   
  <br /><br />
  <button onclick="show();">Show href</button>
</div>

<script>
  let show = () => {
    let element = document.getElementById("mylink");
    alert("Href = " + element.href);
  }
</script>

Code explanation

The id attribute assigns a unique identifier to the link.

Clicking the button calls JavaScript which locates the link using the id.

Finally, the href value of the link is displayed in an alert box.


Browser support

Here is when id support started for each browser:

Chrome
1.0 Sep 2008
Firefox
1.0 Sep 2002
IE/Edge
1.0 Aug 1995
Opera
1.0 Jan 2006
Safari
1.0 Jan 2003

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